MIL-DTL-55302/4F
REQUIREMENTS:
Design and construction:
Dimensions and configuration: See figure 1.
Material:
Guide pins and guide bushing: Brass composition B, 60,000 to 70,000 PSI tensile, as specified in
ASTM B134/B134M, or FC brass as specified in ASTM B16/B16M, or stainless steel in accordance with
ASTM A484/A484M and ASTM A582/A582M, passivated in accordance with SAE-AMS 2700, type 2.
Plating:
Guide pins and guide bushings: Gold over copper, type II, class 1.27, grade C, as in accordance with
ASTM B488.
Contact: Gold in accordance with ASTM B488, type II, grade C, class 1.27, over nickel plating in
accordance with appendix A of MIL-DTL-38999, class 2, 50 to 150 microinches.
Contact identification: Shall be alphabetical and sequential in the pattern indicated, using upper case characters
followed by lower case characters. Dash number 06. The characters shall be numerical and sequential in pattern
indicated.
Socket size: 23.
Wire size: 22.
Current rating: 5 amperes, maximum.
Mating and unmating: The maximum insertion force, in pounds shall not exceed a value equal to 0.5 times the
number of contacts, and the withdrawal force, in pounds, shall be a minimum of 0.11 times the number of contacts,
and shall not exceed the measured insertion force.
Contact resistance: The average resistance of all contact pairs measured shall not exceed .010 ohm, and no
individual contact pair shall have a resistance exceeding .020 ohm.
Dielectric withstanding voltage:
Sea level: 1,000 volts rms, 60 Hz, ac.
High altitude: 500 volts rms, 60 Hz, ac.
Part or Identifying Number (PIN): M55302/4-(dash number on figure 1).
CHANGES FROM PREVIOUS ISSUE: The margins of this specification are marked with vertical lines to indicate
where changes from previous issue were made. This was done as a convenience only and the Government assumes
no liability whatsoever for any inaccuracies in these notations. Bidders and contractors are cautioned to evaluate the
requirements of this document based on the entire content irrespective of the marginal notations and relationship to
the last previous issue.
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